Essex neck to Fender body?

I'm considering buying an Essex bass with the money I got today selling my college books. If I do I'm thinking of picking up one of their p-basses with a maple fretboard. I'm a huge fan of maple fretboards on jazz basses, so if I get one I may switch the rosewood neck of my MIM jazz with the Essex P neck. Anyone here try this or know for sure that the necks fit? Thanks.